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Refresher Question What is a leaf’s main function? Make food! PHOTOSYNTHESIS.

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Presentation on theme: "Refresher Question What is a leaf’s main function? Make food! PHOTOSYNTHESIS."— Presentation transcript:

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2 Refresher Question What is a leaf’s main function? Make food! PHOTOSYNTHESIS

3 Refresher Question What plant structure do you see here: ROOT

4 Refresher Question What is the green pigment that captures light called? Chlorophyll

5 Refresher Question What is the cell organelle that contains chlorophyll called? Chloroplast

6 Plant Video National Geographic Video

7 Photosynthesis Plants use energy from sunlight to make food from carbon dioxide and water. 6CO2 + 6H2O Sunlight C 6 H12O 6 + 6O2 Chlorophyll Green Color Part of the Chloroplasts Captures sunlight

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9 Plant Puzzler What is the energy source that drives photosynthesis? SUN

10 Sugar (Glucose) C 6 H12O 6  6 Carbon, 12 Hydrogen, 6 Oxygen Glucose is stored energy plants use for food Made from CO2, H2O, Sunlight and chlorophyll

11 Plant Puzzler The kind of food produced directly from photosynthesis is __________? Sugar = Glucose = C 6 H12O 6

12 Gas Exchange in Leaves Cuticle: waxy covering that protects plant How does gas “break through” that tough barrier? Stoma! (plural= stomata) an opening in a leaf or stem that allows gas exchange Each stoma has 2 Guard Cells Guard Cells open or close stoma Closed stoma = no gas exchange Open stoma = gas exchange Carbon Dioxide (CO2), Oxygen (O2), and Water Vapor (H2O)

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14 Plant Puzzler An opening in a plant that allows for gas exchange is called a __________? What gases are transported through the stoma? Stoma CO2, O2, H2O

15 Question #1 Put a plant under a dark box. Is this plant undergoing photosynthesis? Why or why not?

16 Question #2 Describe what you think will happen to the life seen here (and on Earth), after a meteor blackened the sky so that no sun could shine through?

17 Question #3 Are the leaves you see here undergoing photosynthesis? Why or why not? Pretend that the branch is still attached to the living tree.

18 Question #4 If you and a large tree were locked in an airtight compartment, with plenty of food, water, and nutrients, could you survive? Explain your answer.


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